From novaes@fnal.gov Mon Nov 11 13:49:25 2002 Date: Mon, 11 Nov 2002 13:45:16 -0600 From: Sergio F. Novaes To: novaes@fnal.gov Subject: FPD News 8/November/2002 Carlos Avila Tuesday, October 22, 2002 TEV ACCESS -OCT 22 - REPORT below is a summary of the tasks that we accomplished during the tunnel access of today: People: on control room: Mike and Wanda on tunnel: Jorge, Carley, Victor, Carlos, Rob kuminsky. 1>) A1IN HOME SWITCH ================== It got replaced and was tested. The LVDt readout for pot all the way in is now 39.72mm. Still needed to check if that value changed. 2) A2IN DRIVER =========== At the beginnig of the access it was realised by Mike that A2in pot was not moving. Victor swapped A2i driver to A2O driver and pot motion was fine. There is a problem with the A2in driver and was taken out of the tunnel for testing. 3) LIGHTS FOR CAMERAS ====================== Bulb lights for the cameras do not get power from the camera power distribution box. The bulb lights were tested and seem to be ok and the problem seems to be in the way they get powered from the camera box. Could not plugged them to different place because they have a special connector that only works with the camera box. Thi has to be resolved for next access. 4) TLD BADGES REMOVED ===================== There were 6 TLD badges since the previous access since oct 02. those badges were removed. They were at the following locations: P2U: TLD 0586463T, #98161 P2I: TLD 1059289T, #98159 P2O: TLD 0571923T, #98160 A1D: TLD 0308172T, #98156 P1I: TLD 0574790T, #98158 A2D: TLD 0683626T, #98157 These TLD badges will be sent out for dose readout, expect numbers in a couple of weeks. 5) TLD BADGES INSTALLED ======================= We decided to install TLD badges again to keep record of radiations levels, specially now that luminosity is getting higher. The places where we installed TLD badges were: A1U: TLD 0575452T, #98187 A1I: TLD 0574138T, #98188 A2I: TLD 0586014T, #98190 A2U: TLD 1059615T, #98189 D1: TLD 1059708T, #98191 P1O: TLD 0573616T, #98186 P1U: TLD 0307454T, #98197 P2U TLD 0308739T, #98196 P2D: TLD 0585458T, #98195 P2O TLD 0570660T, #98193 P2I: TLD 0570861T, #98194 P1I: TLD 0586908T, #98192 6) HELIUM LEVELS AT OUR DETECTOR LOCATIONS ======================================= We measured Helium levels again and found that they were about 300 ppm at our detector locations. 7) COPPER TUBBING FOR PUMPING AIR TO ROMAN POTS =============================================== There was one operations tech assigned to us (RObert kuminsky) who worked from 10:00am till 5:00 pm in the tunnel and connected all the copper tubing to the 12 top cartridge tops we have in the tunnel. Air is supposed to be delivered right into the chamber where the MAPMTs connect to the cookies. Still pending to buy the air pump. We also wanted to connect flowmeters but there were non at D0 for low air flow. We bypassed them and will be connected during next access if needed. Thanks to everybody who helped during the access. __________________________________________________________________________ Wednesday, October 23, 2002 1 pot positions in october We have been looking with Carley the pot positions during runs taken this month. I am sending a link where you can find some preliminary plots on this issue: http://d0server1.fnal.gov/users/avila/pot_positions/potpos_oct.htm We are in the process to look at runs from previous months. __________________________________________________________________________ Sergio F. Novaes [novaes@fnal.gov] Sent: Wednesday, October 23, 2002 4:33 PM To: novaes@fnal.gov Subject: VRVS and West Wing: important changes Hello FPDers, The procedure to introduce a PolyCom equipment (at HighRise) in VRVS have changed (see instructions below for West Wing). However, the procedure for your personal connection in a ongoing meeting remains the same. The Videoconference page (http://www-d0.fnal.gov/fpd/Pages/videoconference.htm) have been updated accordingly. Sergio o Using PolyCom at Wilson Hall with VRVS: Starting Monday October 21st, 2002, there will be new steps to follow when using VRVS with a FNAL videoconference room Polycom ViewStation. 1. Go to http://www.vrvs.org. 2. Enter the booked room and click on H.323 ^ÓSET^Ô button. 3. In the ^ÓHostname/IP or Alias^Ô enter the alias of the Polycom system. For West Wing (FNAL-10, WH10NW) is: 200375. 4. In the ^ÓGatekeeper (if alias)^Ô enter, for West Wing, 198.128.3.86. 5. Select bandwidth 384 and frame rate 12/15. 6. Press ^ÓSAVE^Ô and close the window. 7. Then press H.323 ^ÓJOIN^Ô button to connect VRVS to the PolyCom. 8. To change cameras, press ^ÓNEAR^Ô button on remote control. Three icons will appear, using arrow left and right arrow keys highlight desired camera: main, document or ceiling mounted camera. 9. To end videoconference press green ^ÓCALL/HANG-UP^Ô button twice. __________________________________________________________________________ Carley Martins Wednesday, October 30, 2002 Pots studies In the address http://www-d0.fnal.gov/~cmartins/ you will find some plots regarding halo versus pot position. As you could see from these plots, the correlation between pot position and halo (P_halo and Pbar_halo) is very weak. Take in account that, for a given halo rate, the final position of the pots depends on the shifter (there are fpd shifters who stopped motion at a few % hange of halo rates, while others pushed towards the 10% limit) Further, you will find other plots that shown the pot rates, in home position, in function of luminosity, P_halo and AP_halo. This case seems to be very interessant and some important conclusions can be extracted. This study is not concluded yet and we will be glad if you send us some comments and or suggestion. __________________________________________________________________________ Victor Bodyagin Wednesday, October 30, 2002 where FPD stuff will be here is the expected locations of FPD stuff in CFT crates. 1. VRB board will be in slot 19 crate 0x52 2. SEQUENCER a. in addition to an ordinary sequencer it has SUB_20 which should be downloaded in the format: 16-bit mil 1553 data word -------------------------------------------------------------- I bits from 0 to 5 I Nc Nc I bits from 8 to 13 I Nc Nc I I------------------------------------------------------------- I for Upper PLD I I for Lower PLD I I -------------------------------------------------------------- , where Upper PLD is 6-bit data named as FPD_DEL1 and Lower PLD is 6-bit data named as FPD_DEL2, and Nc means "no care". I guess that FPD_DEL1 and FPD_DEL2 will be two extra fields in sequencer's EPICS record. b. FPD sequencer is expected to be in crate with crate serial number: PC04_1A and with SEQ Controller Ser. No: CFTC_SEQC_03A01 3. AFE For AFE serial crate No. is 14 ( E hex), i.e. Mil-1553 RT address was picked up. Though I addressed this message to Geoff Savage mainly, I would be very grateful to hear any comments from CFT and FPD people. __________________________________________________________________________ FPD Group account Thursday, October 31, 2002 A strange store finally, 4:15 store #1924 began. It turned out to be a strange store. 1. It has low Luminousiity: ~8*e30 from its very beginning. 2. Single rates at home position are: P1U ~67KHz, P1D ~75KHz, P2U ~29KHz, P2D ~48KHz, A1U ~ 33KHz, A1D ~21KHz Before that I never saw rates in P1s' to be higher than rates in P2s' at home position. When I tried to move pots to 10-sigma position I got a huge spike in A-halo rates when P1 pots were at 19mm only, meanwhile the first recommended step for 10-sigma position is 19.57mm. So I found this store to be too unusual to continnue with it. Pots are at home, control lines OFF, HVs are at standby, Daq is running under pulser. Victor. __________________________________________________________________________ Carlos Avila Thursday, October 31, 2002 radiation issues for our detectors The readings for the second set of tlds just arrived this afternoon. You can find the readings for both sets of tld badges at: http://d0server1.fnal.gov/users/avila/tlds/tlds.htm I have made extrapolations of the doses by accumulated time (asumming 5 year operation) and by accumulated luminosity ( assuming a total of 5fb- 1). The extrapolation by accumulated time shows that we will have accumulated dose in the order of 10^4 REM. The extrapolation by accumulated luminosity shows that we will have accumulated dose in the order of 10^5 REM. We want to keep total accumulated dose under 10^5 REM. Some comments below: 1) Due to the fact that our rates have not increased proportional to increase in luminosity, the extrapolation by accumulated luminosity could be taken as an upper limit. Real values will be between accumulated luminosity and acummulated time. 2) An increase in radiation levels for the antiproton side is noticed between first and second tld set. 3) Down detectors that are in a concrete hole ( like P2D) show lower readings than the other pos at same castle (look first tld set). I think we might want to consider to put some sand bags around the beam pipe at the location of our castles. 4) There is a third tld set with 12 tlds at the tunnel right now that will be taken out during next access. Comments are welcome, __________________________________________________________________________ Ricardo Ramirez-Gomez Friday, November 01, 2002 FPD D0 Integration Meetings - Minutes Dear All, The minutes for the FPD D0 integration today's meeting will be located in http://d0server1.fnal.gov/projects/FPD/Hardware/Trigger/meetings/index.h tml I appreciate your comments. __________________________________________________________________________ Andrew Brandt Monday, November 04, 2002 24 hour ops I'll say this again at the meeting, but there are two critical points. 1) If a shifter screws up somehow, you have to let them know about it! They will be taking shifts again, often the next day. 2) There should be a report by the on-call expert detailing briefly: a) how many times they put the pots in during their "shift" b) how many times they were called, and what about c) how much integrated time did they spent in control room d) how many times the pots were taken out during their shift and was it done by the cal shifter or not e) were there any computer problems f) was the system ever not left properly in stand-by and how was this addressed those who have already done their set of shifts, please send out this info today before the meeting if possible. __________________________________________________________________________ Dmitri_Denisov Tuesday, November 05, 2002 January shutdown and next year Tevatron plans Dear Colleagues! Here is update about shutdown and Tevatron performance plans: 1. We will have 3.5 weeks shutdown starting January 13 2003. The begining date might change (not really probable) within next 7-10 days, but will be frozen then. 2. There is ~6 weeks shutdown planned for July-August 2003. 3. For November 2002 Tevatron goals: a) 25pb-1 delivered luminosity; b) beam studies of 2 days every 2 weeks; c) peak luminosity in the 4E31 range. 4. FY 2003 Tevatron goal: delivered luminosity 225pb-1. __________________________________________________________________________ Jorge Luis Barreto Tuesday, November 05, 2002 halo meeting/halo note The plots 1) acp_dip.tar.gz --> 3 plots for dipole pots acceptance for elastic and diffractive (xi=0.02) using various t-distributions; 2) acp_quad.tar.gz --> 6 plots for quad pots (hor., vert., and total) using the same as above distributions. are at: http://www-clued0.fnal.gov/~barreto/fpd __________________________________________________________________________ Victor Bodyagin Wednesday, November 06, 2002 some updates on integration finally we are ready for real debugging of our hardware DB. 1. Vladimir helped us to debug combined SQL script for oracle. Now it can update development DB in one pass. Seemingly it works OK. Vladimir also helped us to debug python script which will be useful in future. Also we have a script for rollback. 2. Today we worked with Jadzia. The attempt was not 100% successful for reasons: a. She introduced a few changes into cft_gui which prevented it from working with old development DB. b. Since we have one AFE board only some of the tables were filled out for this board meanwhile for smooth running of cft_gui it is neccessary to fill out all the tables for even number of AFEs. We've done all neccessary changes already and we ready to try again tomorrow. 3. Today we could not work with George since one of vrbs went down and he had to use the last extra one for replacement. He promised to get vrb for us tomorrow. Wanda & Victor __________________________________________________________________________ Andrew Brandt Friday, November 08, 2002 halo note Hi, here is the halo note that was submitted to Dmitri. We will turn it into a d0 note adding the quantiative radiation info and some plots and table. Comments still welcome. Thanks to everyone who contributed information to this specifically Mike, Gilvan, Carlos, Jorge,+Carley come to mind. A 1) The Forward Proton Detector (FPD) is the D0 subsystem most affected by beam halo backgrounds. The operating positions of the pots with respect to the beam axis are determined by inserting the pots and observing the affect on the D0 halo (our pots typically do not affect halo at CDF). Our current agreement is that the D0 halo should be changed by 10% or less. For stores where the halo levels are worse (or perhaps emittance is worse), the pots cannot be located as close to the beam, which reduces our acceptance for scattered protons and anti-protons, by roughly a factor of 3 for each additional sigma from the beam axis. We would like to (expected to) operate in the 8-9 sigma range for quadrupole spectrometers, but typically are at 10 sigma. The overall rates in our detectors are also an issue. The rates of the detectors in the home position is often in excess of 150 kHz which causes concern about backgrounds and long-term radiation damage to our multi-anode photomultiplier tubes (MAPMT). For some stores we are limited by the rates in our detectors rather than the effect we cause on the halo levels. We have been collecting data about beam halo in order to attempt to automate the pot insertion procedure: variable halo rates make this automation more difficult. Steady-state halo is typically our major concern, as spikes have not so far been a big problem once the beams are stable. Spikes would trip our HV system, but this has only been very rarely observed. Radiation studies using TLD's at the pot locations indicate that depending on the extrapolation approach we expect to see some degradation of PMT response in the worst locations. If we extrapolate by integrated time, the effect should be pretty small <10% at the worst station over the next 5 years, but exptrapolations by integrated luminosity paint a much worse picture of perhaps 50% degradation in the worst areas. We are currently studying this problem--likely the real affect will be between these two limits. To summarize, variable and high halo backgrounds limit FPD acceptance and make operations more problematic and can cause significant radiation damage to our phototubes. 2) Our understanding is that halo background is not currently known to affect physics analyses other than diffractive physics studies, but this is not yet definitive. Much of the halo background can be removed by timing and coincidence cuts. For hard diffractive studies, the addition of a high transverse momentum object greatly reduces the trigger rates and background, but pileup of halo and hard scattering has yet to be evaluated. The full impact will not be known until the FPD is fully integrated into the D0 trigger system in the next couple months. 3) Studies of home rates vs p-halo (D0PHTL) and A-halo (D0AHTL) show that 35 kHz and 2.5 kHz respectively give tolerable rates in the pots. Pot positions have a correlation with these variables, and for values significantly higher than these targets, our acceptance will be seriously affected. 4) Halo simulations by Mokhov and Drozhdin for the FPD proposal had predicted halo rates at the pots about 50-100 times smaller than those observed. New studies by Mokhov are nearly complete and according to him have a new fast (single pass) halo generation term that was not included in the previous simulations, and yield much higher rates. We would like to propose some end of store studies with the Beams Division to test the model and see what can be done to improve the FPD rates. We plan to develop a concrete plan of studies over the next few weeks. ********** More details on good vs bad halo and pot positions: to convert from sigma to position from beam, for each location the equivalence (assuming 20pi emittance and Jan 2002 beam positions) is: P1 1.91mm = 1 sig P2 1.60mm = 1 sig A1 1.07mm = 1 sig D1I 0.73mm = 1 sig D2I 0.80mm = 1 sig would like to operate 8-9 sigma for P,A pots 12-14 sigma for D pots "Good" Halo Quad (all rates in kHz) PHalo = 36.6, AHalo = 2.4 Home 12sig 10sig P1U 40.5 79.1 86.1 P2U 51.1 74.5 76.6 P2D 83.3 114.5 122.4 A1D 35.3 78.6 80.3 Pot insertion halted due to 10% increases in a-halo losses from Pside pot movement (A pots moved to matched sigma). Rates not increasing quickly so pots could in principal go further in if 10% restriction were relaxed. Bad Halo Quad PHalo = 37.4, AHalo = 3.0 Home 12sig 10sig P1U 68 120 P2U 85 116 P2D 137 <----- insertion to 20.5sig brings rate to 148 where stopped A1D 62 128 Pot isertion stopped due to mix of rates and 10% A-halo losses Dipole: PHalo=30.2, AHalo = 2.03 Home 19sig 17sig D1I 8.6 34.3 37.3 D2I 8.8 30 43.4 stopped because next 1mm step for D2I increased rates to ~140kHz no impact on halo losses (for dipole pots we are operating in a fast increaseing region where small additional insertions blow-up our rates). __________________________________________________________________________ John Womersley Monday, November 11, 2002 Tevatron plans for 2003 and beyond Dear colleagues, At the link below you will find the slides which I showed on Friday morning at the All-D0 Meeting. http://d0server1.fnal.gov/projects/d0_pictures/presentations/womersley/ADM-N ov-8-2002.pdf For those who were not there, some words of explanation will be useful. The laboratory recently had a Department of Energy Review of accelerator operations, and this required planning both for next year and the years beyond. The FY2003 plan is in place: it is conservative, in the sense that it does not require major performance improvements to meet the goals. In the future years the planning is not so firm (and DOE will return for a follow up review in June 2003). The projections that are shown now take longer than hoped to reach the full Run II goals, and there is a realization that we need to be flexible about the end date of Run II. The laboratory is clearly committed to the collider run and to the need to reach signficant luminosities. A lot of this information is new and still not firm. We can and should influence the process. One way is for us in D0 to remain clear about our own physics goals and our own determination to do the best possible physics this year, next year and every year, as long as the Tevatron collider remains a unique facility in the world. Another important goal is for us to show physics results that go beyond Run I at the summer 2003 meetings: this will emphasize that Run II is about physics and not accelerator milestones. It is also important to emphasize that the Run IIb upgrade remains on track. The project was successfully reviewed by an external committee last week and Peter Rosen signed off on the Acquisition Execution Plan (one of the required project documents). The lab director has told HEPAP last week that we need to start spending money in January in order to keep the schedule. This schedule, agreed at the Lehman review, is needed to have the new detector installed in time (given radiation damage to the old one) in the latest accelerator projections. Please share this information with members of your group. __________________________________________________________________________ Sergio F. Novaes Fermilab E-mail: novaes@fnal.gov P.O. Box 500 Phone: (630) 840.2454 Mail Station 352 Cell: (630) 272.1819 Batavia, IL 60510-0500 Fax: (630) 840.8886 USA __________________________________________________________________________